Will it be possible for you to decompose water by heat or light energy

Will it be possible for you to decompose water by heat or light energy ?
If you pass current from a 6 volt battery is decomposition of water
possible ?

Ans. If you take pure water it is not possible to decompose water by heat or light
energy or using a 6 volt battery. But if you add a few drops of acid to water
then it is possible to decompose acidulated water by passing current from
a 6 volt battery.